People in a rural area of northern california are being told to lock their doors this morning after police say man brazenly entered a home and sill kiled an 8-year-old girl. Reporter: Police say the call came in saturday at noon. The girl's 12-year-old brother says he found an intruder inside their home when the man fled, the boy found his sister stabbed. The 12-year-old was able to give police only a vague description of the suspect. A white or hispanic male adult. The age was not clear. The clothing was blue jeans and black or dark shirt. Reporter: Police say the brother is not a suspect at this time. We're continuing to talk to him. That would be normal because he was the last person with the child. Reporter: Police and csi teams scoured the crime scene. We collected finger prints and we what's we believe to be dna. Reporter: An all-out man hunt is under way. It's a difficult area to search. There are a lot of empty homes and outbuildings. Huge rock croppings where somebody can hide. Reporter: And this morning, still no sign of a suspect. For "good morning america," cecilia vega, abc news, los angeles.

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